Magnetohydrodynamics, Dark Energy and Closed Null Curves: Towards a Family of Astrophysical Compact Objects

TL;DR

This paper develops a family of non-singular, horizon-free models of compact astrophysical objects incorporating dark energy, magnetic fields, and null geodesics, with potential implications for understanding exotic stellar structures.

Contribution

It introduces a novel class of equilibrium models for compact objects using Einstein equations with specific matter fields, avoiding singularities and horizons without prior metric assumptions.

Findings

Metrics are free of singularities and horizons.

Null geodesic geometry determines one metric element.

Radial coordinate must be positive, avoiding central singularity.

Abstract

Starting with a static, spherically symmetric spacetime incorporating critical (unstable) closed null geodesics, a family of models for equilibrium states of non-isolated compact objects is obtained by solving the Einstein equations for an energy-momentum tensor featuring a perfect fluid with ideal-gas equation of state, dark energy, and a magnetic field. All of these source fields are described by simple, monotonically decreasing mathematical functions. No ansatz is made for either of the two unknown metric elements;the null curve geometry yields one, and the other follows from a simplification of the magnetic field vector. The metric elements are free of singularities and horizons everywhere, although their inverses are singular at the origin. The entire metric assumes its Lorentzian form at infinity. The geometry of this model, as well as fundamental quantum considerations, require that the radial coordinate must always be greater than zero, thereby obviating the physical singularity at the origin.